Inductor design/construction - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #21 of 25 Old 05-19-08, 03:36 AM Thread Starter
drf
drf
 
Join Date: Oct 2006
Location: Somewhere else.
Posts: 1,249
Re: Inductor design/construction

I didn't think you were having ago. I just want to be as thorough as I can. Especially when things can get very complicated very quickly in this field.


Although it is hard, you can get away without having an inductance meter. but it requires a bit of patience and a lot of testing/retesting until you are happy with the results.
drf is offline  
Sponsored Links
Advertisement
 
post #22 of 25 Old 05-31-08, 01:33 AM Thread Starter
drf
drf
 
Join Date: Oct 2006
Location: Somewhere else.
Posts: 1,249
Re: Inductor design/construction

Well I finally got hold of an off-the-shelf inductor, I grabbed a couple of .22mH but I needed .6mH so it isn't exactely a fair comparison but good enough for what I have done. Both off-the-shelf inductors measured to there rated henries, however the dcr was rated at .3ohms (a little too hopefull I think), they actually measured at .8 ohms. I require a 0.6mH for some speakers I am currently working on, so I decided I would spend a litle more time on these inductors (6 minutes instead of five) and see if the results are better or worse. This is the inductor all wound up on the meter:

Inductor design/construction-measure.jpg

As you can see 0.59mH. Not bad considering the nearest off-the-shelf is either 0.56 or 0.82.
The dcr was 1.7ohms, which is also within cooee of the expected. The other advantages I had with this was that not only is it closer to what I actually need but it was half the price and can handle more power. The ots inductor was only rated to 100watts yet the DIY should be able to run at 180watts.

One last shot:

Inductor design/construction-coil-018.jpg
drf is offline  
post #23 of 25 Old 05-31-08, 08:01 AM
Senior Shackster
 
eyekode's Avatar
eyekode
 
Join Date: Jan 2008
Location: Apex, NC
Posts: 267
Re: Inductor design/construction

Quote:
Anthony wrote: View Post
well, the inductor is probably the ONLY one you can build yourself
You might be able to wrap your own non-inductive resistors as well. There is at least one outfit that sells these for 50$ a piece! I cannot imagine they are worth it but...
eyekode is offline  
 
post #24 of 25 Old 07-27-08, 10:46 AM
Shackster
 
phaseshift's Avatar
Gui Lao
 
Join Date: May 2007
Location: Shenzhen, China
Posts: 45
Re: Inductor design/construction

The inductors you are making are every bit as good as the ones you can buy commercially provided you can get good wire. Hint- Know any places that sell supplies to re-wind electric motors? You can get magnet wore from them cheaper and yes, it is the same stuff, but the annealing is more likely to have been done correctly and the lacquer is likely going to be a bit better quality- flexible and heat resistant. You will also have a much wider selection of wire diameters and you may even find some tweak stuff for use in high end applications.

One caution with your winding gizmo thing-a-ma-bob. Careful to not cut or scratch the wire when you are removing the finished product from the mandrel. You might consider wrapping the mandrel with a piece of paper and wind the coil onto the top of that- then they slide right off the mandrel with no risk of nicks. The nicks are more critical if you are doing iron cores and not winding direct to the core.

If you have a good LCR and you are not in a hurry, you can wind 1% without too much issue.
phaseshift is offline  
post #25 of 25 Old 07-29-08, 07:14 PM
myn
Senior Shackster
myn
 
Join Date: Sep 2006
Posts: 122
Re: Inductor design/construction

Very interesting topic
myn is offline  
Reply

Bookmarks

Tags
design or construction , inductor

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome